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1,120,475 5 11. Apparatus for purifying combustible In testimony whereof, I affix my signature gases comprising a plurality of chambers, in the presence of two subscribing witnesses. each provided with means for maintaining ELMON L. HALL. therein a high potential electric discharge, 5 alternating with a plurality of purifying Witnesses: chambers, said chambers being serially con- WM. H. BARTON, *necte4. ARCHEE N. HOSNER.